Coin

In SonoCoin value is often transferred by sharing a special data structure with a recipient. This data structure is aptly called a coin. A coin is made up of the following elements:

Size	Name	Type	Comment
64	Key	[64]byte	Private key for a utxo
32	TxHash	[32]byte	hash of the transaction
4	Index	uint32	Index of the utxo

Coin Reissuance

When a coin is transmitted from one user to another, the private key is shared between the users which causes a race condition. The recipient has to reissue their coin to make the transfer final. This is done by creating a new key pair and issuing a transaction that spends the UTXO associated with the private key to the generated public key.

Coin Transfer

Coins can be transmitted between SonoCoin clients by a variety of methods (Sound, Light, QR-Code). The following illustration shows how SonoCoin’s mobile clients create the sound file.

A simplified view of the SonoCoin sound generation algorithm.